/* ============================================
   福墨网络 - 企业官网样式
   河南福墨网络科技有限公司
   ============================================ */

:root {
  /* 主色：深蓝 + 靛紫 */
  --color-primary: #1e3a5f;
  --color-primary-light: #2d4a6f;
  --color-accent: #4f46e5;
  --color-accent-hover: #6366f1;
  --color-accent-muted: rgba(79, 70, 229, 0.12);

  /* 中性色 */
  --color-bg: #f8fafc;
  --color-bg-alt: #f1f5f9;
  --color-text: #1e293b;
  --color-text-muted: #64748b;
  --color-border: #e2e8f0;

  /* 间距 */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;

  /* 圆角 */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;

  /* 阴影 */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.1);

  /* 过渡 */
  --transition-fast: 0.15s ease;
  --transition-base: 0.25s ease;
}

/* Reset & Base */
*, *::before, *::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

/* 可访问性：焦点样式 */
:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* ========== 顶部导航 ========== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(248, 250, 252, 0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  transition: var(--transition-base);
}

.header.scrolled {
  box-shadow: var(--shadow-sm);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--space-md) var(--space-lg);
}

.logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-primary);
  text-decoration: none;
  letter-spacing: 0.02em;
}

.logo:hover {
  color: var(--color-accent);
}

.nav-menu {
  display: flex;
  list-style: none;
  margin: 0;
  padding: 0;
  gap: var(--space-xl);
}

.nav-menu a {
  color: var(--color-text-muted);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  padding: var(--space-sm) 0;
  transition: color var(--transition-fast);
}

.nav-menu a:hover,
.nav-menu a.active {
  color: var(--color-accent);
}

/* 移动端菜单按钮 */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: var(--space-sm);
  background: none;
  border: none;
  cursor: pointer;
  aria-label: "展开菜单";
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text);
  transition: var(--transition-fast);
}

.nav-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.nav-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* ========== Hero 区 ========== */
.hero {
  position: relative;
  min-height: 85vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: calc(80px + var(--space-3xl)) var(--space-lg) var(--space-3xl);
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--color-primary) 0%, #312e81 50%, var(--color-accent) 100%);
  opacity: 0.97;
}

.hero-bg::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 80% 50% at 50% 0%, rgba(255,255,255,0.08) 0%, transparent 60%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  text-align: center;
  max-width: 720px;
}

.hero-title {
  font-size: clamp(1.75rem, 5vw, 2.5rem);
  font-weight: 700;
  color: #fff;
  line-height: 1.3;
  margin: 0 0 var(--space-lg);
  letter-spacing: 0.02em;
}

.hero-subtitle {
  font-size: clamp(0.95rem, 2.5vw, 1.1rem);
  color: rgba(255, 255, 255, 0.9);
  margin: 0 0 var(--space-2xl);
  max-width: 560px;
  margin-left: auto;
  margin-right: auto;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  justify-content: center;
}

/* ========== 按钮 ========== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-md) var(--space-xl);
  font-size: 0.95rem;
  font-weight: 600;
  font-family: inherit;
  text-decoration: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  border: none;
}

.btn-primary {
  background: #fff;
  color: var(--color-primary);
}

.btn-primary:hover {
  background: rgba(255, 255, 255, 0.95);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.15);
  color: #fff;
  border: 2px solid rgba(255, 255, 255, 0.5);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.25);
  border-color: rgba(255, 255, 255, 0.8);
}

.btn-full {
  width: 100%;
}

/* ========== 通用区块 ========== */
.section {
  padding: var(--space-3xl) var(--space-lg);
}

.section-alt {
  background: var(--color-bg-alt);
}

.container {
  max-width: 1200px;
  margin: 0 auto;
}

.section-title {
  font-size: clamp(1.5rem, 3vw, 1.875rem);
  font-weight: 700;
  color: var(--color-primary);
  text-align: center;
  margin: 0 0 var(--space-2xl);
}

/* ========== 卡片 ========== */
.card-grid {
  display: grid;
  gap: var(--space-xl);
}

.card-grid-3 {
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.card {
  background: #fff;
  padding: var(--space-xl);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
  transition: all var(--transition-base);
}

.card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
  border-color: var(--color-accent-muted);
}

.card-icon {
  font-size: 2rem;
  margin-bottom: var(--space-md);
}

.card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-primary);
  margin: 0 0 var(--space-sm);
}

.card p {
  margin: 0;
  color: var(--color-text-muted);
  font-size: 0.95rem;
}

/* ========== 滚动动画 ========== */
[data-animate] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

[data-animate].visible {
  opacity: 1;
  transform: translateY(0);
}

/*  stagger 子元素 */
.card-grid [data-animate] {
  transition-delay: calc(var(--i, 0) * 0.1s);
}

/* ========== 技术标签 ========== */
.tech-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  justify-content: center;
}

.tech-tag {
  padding: var(--space-sm) var(--space-lg);
  background: var(--color-accent-muted);
  color: var(--color-accent);
  font-size: 0.9rem;
  font-weight: 500;
  border-radius: 999px;
  transition: all var(--transition-fast);
}

.tech-tag:hover {
  background: var(--color-accent);
  color: #fff;
}

/* ========== 成果数据 ========== */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: var(--space-xl);
  text-align: center;
  margin-bottom: var(--space-xl);
}

.stat-item {
  padding: var(--space-xl);
}

.stat-value {
  display: block;
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--color-accent);
  margin-bottom: var(--space-xs);
}

.stat-label {
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

.disclaimer {
  text-align: center;
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin: 0;
}

/* ========== 服务流程 ========== */
.process-flow {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
}

.process-step {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: var(--space-lg) var(--space-md);
  background: #fff;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  min-width: 100px;
  transition: all var(--transition-fast);
}

.process-step:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-sm);
}

.process-num {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-accent);
  margin-bottom: var(--space-xs);
}

.process-step span:last-child {
  font-size: 0.9rem;
  color: var(--color-text);
}

.process-arrow {
  color: var(--color-text-muted);
  font-size: 1.25rem;
}

/* ========== 关于我们 ========== */
.about-content {
  max-width: 680px;
  margin: 0 auto;
}

.about-content p {
  margin: 0 0 var(--space-md);
  color: var(--color-text-muted);
  font-size: 1rem;
}

.about-content p:last-child {
  margin-bottom: 0;
}

/* ========== 联系我们 ========== */
.contact-wrapper {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-2xl);
  max-width: 800px;
  margin: 0 auto;
}

.contact-info {
  padding: var(--space-lg) 0;
}

.contact-note {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  margin: 0 0 var(--space-lg);
}

.contact-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.contact-list li {
  margin-bottom: var(--space-sm);
  font-size: 0.95rem;
  color: var(--color-text);
}

.placeholder {
  color: var(--color-text-muted);
}

/* 表单 */
.contact-form {
  background: #fff;
  padding: var(--space-xl);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}

.form-group {
  margin-bottom: var(--space-lg);
}

.form-group label {
  display: block;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text);
  margin-bottom: var(--space-xs);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: var(--space-md);
  font-size: 1rem;
  font-family: inherit;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-bg);
  transition: border-color var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-accent);
}

.form-group textarea {
  resize: vertical;
  min-height: 100px;
}

/* ========== 页脚 ========== */
.footer {
  background: var(--color-primary);
  color: rgba(255, 255, 255, 0.9);
  padding: var(--space-xl) var(--space-lg);
  text-align: center;
}

.footer-copy {
  margin: 0 0 var(--space-xs);
  font-size: 0.9rem;
}

.footer-icp {
  margin: 0;
  font-size: 0.8rem;
  opacity: 0.8;
}

/* ========== Toast ========== */
.toast {
  position: fixed;
  bottom: var(--space-xl);
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  padding: var(--space-md) var(--space-xl);
  background: var(--color-primary);
  color: #fff;
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
  z-index: 2000;
}

.toast.show {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}

/* ========== 响应式 ========== */

/* 768px */
@media (max-width: 768px) {
  .nav-menu {
    position: fixed;
    top: 60px;
    left: 0;
    right: 0;
    flex-direction: column;
    background: rgba(248, 250, 252, 0.98);
    padding: var(--space-xl);
    gap: var(--space-md);
    border-bottom: 1px solid var(--color-border);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
  }

  .nav-menu.open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .nav-toggle {
    display: flex;
  }

  .hero {
    min-height: 75vh;
  }

  .contact-wrapper {
    grid-template-columns: 1fr;
  }

  .process-flow {
    flex-direction: column;
  }

  .process-arrow {
    transform: rotate(90deg);
  }
}

/* 375px */
@media (max-width: 375px) {
  .nav {
    padding: var(--space-md);
  }

  .hero-cta {
    flex-direction: column;
  }

  .btn {
    width: 100%;
  }

  .section {
    padding: var(--space-2xl) var(--space-md);
  }

  .card {
    padding: var(--space-lg);
  }

  .process-step {
    min-width: auto;
    width: 100%;
  }
}